Axial positioning method for high-pressure gas leakage point in narrow and long limited space

The invention discloses an axial positioning method for a high-pressure gas leakage point in a long and narrow limited space. The axial positioning method comprises the following steps that S1, monitoring equipment is installed on the inner side and the outer side of outlets in the two ends of the long and narrow limited space and debugged and corrected; s2, acquiring internal and external wind speed and wind direction data of outlets at two ends of the narrow and long limited space; s3, judging whether leakage occurs or not; s4, calculating the flow at the two ends of the leakage point and the total leakage amount; s5, calculating a flow friction resistance coefficient and a local resistance coefficient; and S6, determining the axial position of the leakage point according to the equal flow resistance at the two ends. The method does not depend on detection of a specific gas concentration detection sensor, has no specific limitation on types of leaked gas, is novel in leakage detection principle, quick in re